72444556 has 6 divisors (see below), whose sum is σ = 126777980. Its totient is φ = 36222276.

The previous prime is 72444539. The next prime is 72444563. The reversal of 72444556 is 65544427.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055566 + ... + 9055573.

Almost surely, 2^72444556 is an apocalyptic number.

It is an amenable number.

72444556 is a deficient number, since it is larger than the sum of its proper divisors (54333424).

72444556 is a wasteful number, since it uses less digits than its factorization.

72444556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18111143 (or 18111141 counting only the distinct ones).

The product of its digits is 134400, while the sum is 37.

The square root of 72444556 is about 8511.4367764790. The cubic root of 72444556 is about 416.8712248556.

The spelling of 72444556 in words is "seventy-two million, four hundred forty-four thousand, five hundred fifty-six".